As with all processing, your personal taste counts for something. This tutorial is set up to allow you to tweak to your heart's content. This process is not meant to be a one-size-fits-all tute, rather some insight into different ways to play around with your image. This tutorial also assumes you have a good understanding of Photoshop.

With the top (dark) curves adjustment layer selected and your foreground color set to black, use a soft brush (0% hardness) at a low opacity (around 20%) to paint over any place that has gotten too dark.

Go to Image > Adjustments > Shadows/Highlights and use the Shadows sliders to bring up some of the darker parts of the image, being careful not to lose the contrast in the brighter parts of the image. This is done to personal taste.

If you want to go "extra crispy," merge visible into a new layer (Shift + Alt + Cmd/Ctrl + E) and set the blending mode of this layer to Vivid Light. Run the High Pass filter on this layer with a radius of 4.